> But if you believe this, why do you think hard-headed capitalists are
> willing to accept dollars in exchange for commodities at current price
> levels?
>
because it is legally tender, valid for payment of all private and
public debts and recognised as such by the courts. Capitalists and others
are also obliged to make payments in dollars as taxes by law, this
gives it an enforced circulation resting on social relations outside
of commodity production.